Unit 1 Grammar and usage —语法·提升语言能力 （语法项目—动词不定式作主语和表语）（课件PPT）-【新课程学案】新教材2022-2023学年高中英语选择性必修第一册（译林版2020）

Grammar and usage—语法·提升语言能力 课时目标 1. 把握语篇“外出吃饭和在家做饭”的脉络框架，并在此基础上观察文中动词不定式的使用情况，自主归纳、总结动词不定式作主语和表语的核心规则。 2. 通过改写句子的练习，巩固所学，内化新知；运用非谓语动词完成主题为“旋转餐厅”的语篇综合练习。 3. 正确使用动词不定式完成写一封感谢信的写作任务，学以致用。 语法项目——动词不定式作主语和表语 初识语法——在美文运用中体悟　 These days, the attitude of many people is just to eat① food that they think tastes good. However, this can lead to an unbalanced diet, which often results in short-term and long-term health issues. To stay② healthy, you need a balanced diet. Needless to say, it is not always easy to plan③ such a diet, but the good thing is that there is a lot of advice out there. To save④ yourself some time, you could try looking at a “food pyramid” — a chart that shows you how much of each type of food to eat⑤. You could also make healthy food at home and try to avoid⑥ eating packaged foods or fast food. It is essential for you to eat⑦ healthy food. You will feel better, have more energy, and have fewer health problems in later life. ①处的不定式在句中作表语； ②和④处的不定式在句中作目的状语； ③和⑦处的不定式在句中作主语，前面的it为形式主语； ⑤处的不定式在句中作定语； ⑥处的不定式在句中作宾语。 慧学语法——在归纳演绎中学通　 一、动词不定式作主语　 [先感知] ①To see is to believe.百闻不如一见。 ②To get up early is necessary.早起是必要的。 ③It's not easy to work out the problem. 计算出这道题不容易。 ④It's important for us to keep the water clean. 保持水质清洁对我们来说是重要的。 ⑤It's very kind of you to say so. 你这样说真是太好了。 ⑥It took me more than an hour to do my homework yesterday evening. 昨天晚上我做作业用了一个多小时。 [会发现] 动词不定式(短语)作主语时既可以位于句首，也可以后置，后置时，句首要用形式主语 ；动词不定式作主语时，谓语动词应用 数。 it 单 [明规则] it作形式主语时的常见句式： 1．It＋be＋adj.(important, necessary, easy, difficult ...)＋for sb.＋ to do sth.(表语为形容词，描述事物的性质) 2．It＋be＋adj.(kind, generous, considerate, helpful ...)＋of sb.＋ to do sth.(表语为形容词，表示不定式的逻辑主语的性质或特征) 3．It be＋n.(fun, honour, pleasure)＋动词不定式(表语为名词) 4．It takes/took/will take sb.some time/money to do sth.　　 [对点练]　(单句语法填空) ①(2021·全国甲卷)It is possible (walk) or bike the entire 14 kilometers. ②(2021·1月新高考8省联考卷)It can be easy (let) a particular school become a front-runner early on in your decision